Light, sound, energy transformation - fifth

Hilda shouts "hey" in an empty hall at the shopping mall. The sound bounces off the walls and she hears "hey" over and over again. Hilda has just made

• a recording
• an echo
• a circuit
• a wavelength

All sound is made by

• vibrations
• heat energy
• magnetism
• reflections

Reflection occurs when

• light bends.
• light shines in your eyes. 
• light goes through a surface. 
• light strikes a surface and bounces off. 

Which object would BEST reflect light from a light bulb?

• a shiny spoon
• notebook paper
• a black sweater
• a glass of water

A scientist wanted to conduct an experiment with special equipment that is very sensitive to sound. A place where the equipment would NOT be affected by sound waves is

•  deep under water.
• high in the air. 
• in a solid piece of granite. 
• in outer space. 

The sound that a person hears from a drum is produced by

• echoes
• reflections
• pulses
• vibrations

Which would make the softest sound?

• balloon popping
• hammer hitting a nail
• eraser hitting a chalkboard
• metal rod hitting a musical triangle

Grace tapped the glass with a metal spoon and heard a sound. Which action would raise the pitch when she taps the glass again with the metal spoon?

• Pour some of the water out of the glass.
• Put more water into the glass.
• Heat the water in the glass.
• Cool the water in the glass. 

The picture shows a study that Isaac Newton made with a prism to produce a spectrum. Newton's discovery led most directly to an understanding of the cause of —

• x-rays
• sunspots
• rainbows
• starlight

One student played high pitch notes and then low pitch notes on a guitar.

What caused the difference in the high pitch and low pitch notes?

• the age of the guitar strings
• the color of the guitar strings
• the material of the guitar strings
• the vibrations of the guitar strings